Read by QxMD icon Read

potentiometer sensor

Azumi Araki, Kazuhide Makiyama, Hiroyuki Yamanaka, Daiki Ueno, Kimito Osaka, Manabu Nagasaka, Takahiro Yamada, Masahiro Yao
BACKGROUND: Laparoscopic surgical techniques are difficult to learn, and developing such skills involves a steep learning curve. To ensure surgeons achieve a high skill level, it is important to be able to measure and assess their skills. Therefore, it is necessary to understand the performance differences between experienced and novice surgeons, as such information could be used to help surgeons learn laparoscopic skills. We examined the differences in gripping and reaction force between experienced and novice surgeons during laparoscopic surgery...
August 29, 2016: Surgical Endoscopy
Useok Jeong, Kyu-Jin Cho
Bend sensors have been developed based on conductive ink, optical fiber, and electronic textiles. Each type has advantages and disadvantages in terms of performance, ease of use, and cost. This study proposes a new and low-cost bend sensor that can measure a wide range of accumulated bend angles with large curvatures. This bend sensor utilizes a Bowden-cable, which consists of a coil sheath and an inner wire. Displacement changes of the Bowden-cable's inner wire, when the shape of the sheath changes, have been considered to be a position error in previous studies...
2016: Sensors
Stefan Lambrecht, Samuel L Nogueira, Magdo Bortole, Adriano A G Siqueira, Marco H Terra, Eduardo Rocon, José L Pons
This paper presents the comparison between cooperative and local Kalman Filters (KF) for estimating the absolute segment angle, under two calibration conditions. A simplified calibration, that can be replicated in most laboratories; and a complex calibration, similar to that applied by commercial vendors. The cooperative filters use information from either all inertial sensors attached to the body, Matricial KF; or use information from the inertial sensors and the potentiometers of an exoskeleton, Markovian KF...
2016: Sensors
Jason Bell, Xiangrong Shen, Edward Sazonov
This paper describes a method for early detection of posture transitions in a powered orthotic brace purposed for assisting elderly people in sit-to-stand transitions. The detection system is constructed using a linear Support Vector Machine classifier that is trained from features extracted from the signals produced by the sensors mounted on the orthosis. The sensors include accelerometers, potentiometers, gyroscopes and force sensors. The data were collected from 9 healthy individuals that performed various activities, including transitions between sitting, standing and walking...
2015: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Yusuke Kanno, Kosuke Ino, Chika Sakamoto, Kumi Y Inoue, Masahki Matsudaira, Atsushi Suda, Ryota Kunikata, Tomohiro Ishikawa, Hiroya Abe, Hitoshi Shiku, Tomokazu Matsue
This paper describes potentiometric bioimaging for enzyme activity using a large-scale integration (LSI)-based electrochemical device with 400 sensors. Potentiometric detection is useful for bioimaging because redox species are not consumed or produced during the detection process; therefore, there is no effect on cell activity and the detectable signal is sustained. In this study, the potentiometer mode of the LSI-based device was applied for the detection of glucose oxidase (GOx) and alkaline phosphatase (ALP) activity...
March 15, 2016: Biosensors & Bioelectronics
Shih-Ching Chen, Tsung-Hsun Hsieh, Wen-Jia Fan, Chien-Hung Lai, Chun-Lung Chen, Wei-Feng Wei, Chih-Wei Peng
Recent advances in microelectronics and wireless transmission technology have led to the development of various implantable sensors for real-time monitoring of bladder conditions. Although various sensing approaches for monitoring bladder conditions were reported, most such sensors have remained at the laboratory stage due to the existence of vital drawbacks. In the present study, we explored a new concept for monitoring the bladder capacity on the basis of potentiometric principles. A prototype of a potentiometer module was designed and fabricated and integrated with a commercial wireless transmission module and power unit...
2015: Sensors
Tae Yong Kim, Sung A Hong, Sung Yang
In this study, we describe a novel solid-state thin-film Ag/AgCl reference electrode (SSRE) that was coated with a protective layer of graphene oxide (GO). This layer was prepared by drop casting a solution of GO on the Ag/AgCl thin film. The potential differences exhibited by the SSRE were less than 2 mV for 26 days. The cyclic voltammograms of the SSRE were almost similar to those of a commercial reference electrode, while the diffusion coefficient of Fe(CN)63- as calculated from the cathodic peaks of the SSRE was 6...
2015: Sensors
Hiroyuki Yamanaka, Kazuhide Makiyama, Kimito Osaka, Manabu Nagasaka, Masato Ogata, Takahiro Yamada, Yoshinobu Kubota
Objectives. Here we developed a unique training system, a patient specific virtual reality simulator, for laparoscopic renal surgery. To develop the simulator, it was important to first identify the physical properties of the organ. Methods. We recorded the force measured during laparoscopic surgery performed on pigs by using forceps with pressure sensors. Several sensors, including strain gauges, accelerometers, and a potentiometer, are attached to the forceps. Results. Throughout the experiment, we measured the reaction force in response to the forceps movement in real time...
2015: Advances in Urology
Frank A Petrigliano, Per Henrik Borgstrom, William J Kaiser, David R McAllister, Keith L Markolf
PURPOSE: The pivot shift has been correlated with patient-reported outcomes and knee function following ACL injury and reconstruction. Tibial rotation has been recognized as an important component to the pivot shift motion path. However, few methodologies exist to quantify tibial rotation in the clinical setting. The purpose of this study was to validate the use of a wireless gyroscopic sensor to measure axial rotation of the tibia during a manually simulated pivot shift manoeuvre in cadaveric specimens...
August 2015: Knee Surgery, Sports Traumatology, Arthroscopy: Official Journal of the ESSKA
L S Tessutti, D V Macedo, L T Kubota, A A Alves
The use of potentiometry to measure plasma antioxidant capacity to contribute to oxidative stress evaluation is presented. In this assay, plasma (n=60) diluted (0.3 to 1 ml) in phosphate buffer, pH 7.4, NaCl 9%, was submitted to potentiometry. A platinum wire was the working electrode and saturated calomel the reference. The results are presented as the difference between sample and buffer potential (ΔE). ΔE presented a good inverse correlation with added increasing concentrations of ascorbate (2.5-75 μmol/L; R=-0...
October 15, 2013: Analytical Biochemistry
Georg D Strbac, Katharina Giannis, Ewald Unger, Martina Mittlböck, Christoph Vasak, Georg Watzek, Werner Zechner
BACKGROUND: Intrabony temperature increase is not only dependent on shearing energy and mechanical friction between bone and surgical drill but is also related to heat capacity and thermal conductivity of the surrounding bone and the applied surgical instrument. Thus time of occurrence of the highest temperature rise can be expected after the shearing process of the osteotomy, potentially affecting the process of osseointegration. PURPOSE: The aim of this study was to evaluate temperature changes during the shearing and withdrawing processes during osteotomies...
February 2015: Clinical Implant Dentistry and related Research
Andrés Cela, J Javier Yebes, Roberto Arroyo, Luis M Bergasa, Rafael Barea, Elena López
Humanoid robotics is a field of a great research interest nowadays. This work implements a low-cost teleoperated system to control a humanoid robot, as a first step for further development and study of human motion and walking. A human suit is built, consisting of 8 sensors, 6 resistive linear potentiometers on the lower extremities and 2 digital accelerometers for the arms. The goal is to replicate the suit movements in a small humanoid robot. The data from the sensors is wirelessly transmitted via two ZigBee RF configurable modules installed on each device: the robot and the suit...
2013: Sensors
Narayan Yoganandan, John R Humm, Frank A Pintar, Karen Brasel
The objective of this study was to determine region-specific deflection responses of the WorldSID and ES2 -re devices under pure lateral and oblique side impact loading. A modular, anthropometry-specific load wall was used. It consisted of the Shoulder, Thorax, Abdomen, superior Pelvis, and inferior Pelvis plates, termed the STAPP load wall design. The two devices were positioned upright on the platform of a bench seat, and sled tests were conducted at 3.4, 6.7, and 7.5 m/s. Two chestbands were used on each dummy at the thoracic and abdominal regions...
November 2011: Stapp Car Crash Journal
Saurabh Dargar, Ganesh Sankaranarayanan, Suvranu De
Virtual Basic Laparoscopic Skills Trainer (VBLaST) is a virtual reality trainer that replicates the Fundamentals of Laparoscopic Surgery (FLS) tasks for training in minimally invasive surgery. For the ligation loop task, we have developed a novel hardware interface using a linear motion stroke potentiometer to accurately sense the linear translation of the ligation loop and a mechanism to attach the tool interface to a PHANToM Omni for force feedback. Testing shows that the interface provided a realistic feel and control of the loop similar to the endoloop device used in FLS ligation loop task...
2012: Studies in Health Technology and Informatics
Pierre L Levesque, Shadi S Sabri, Carla M Aguirre, Jonathan Guillemette, Mohamed Siaj, Patrick Desjardins, Thomas Szkopek, Richard Martel
Graphene field effect transistors (FETs) are extremely sensitive to gas exposure. Charge transfer doping of graphene FETs by atmospheric gas is ubiquitous but not yet understood. We have used graphene FETs to probe minute changes in electrochemical potential during high-purity gas exposure experiments. Our study shows quantitatively that electrochemistry involving adsorbed water, graphene, and the substrate is responsible for doping. We not only identify the water/oxygen redox couple as the underlying mechanism but also capture the kinetics of this reaction...
January 12, 2011: Nano Letters
Frank Sup, Huseyin Atakan Varol, Jason Mitchell, Thomas Withrow, Michael Goldfarb
This paper presents an overview of the design and control of an electrically powered knee and ankle prosthesis. The prosthesis design incorporates two motor-driven ball screw units to drive the knee and ankle joints. A spring in parallel with the ankle motor unit is employed to decrease the power consumption and increase the torque output for a given motor size. The device's sensor package includes a custom load cell to measure the sagittal socket interface moment above the knee joint, a custom sensorized foot to measure the ground reaction force at the heel and ball of the foot, and commercial potentiometers and load cells to measure joint positions and torques...
October 19, 2008: Proceedings of the ... IEEE/RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics
M F Laguesse
A new method is proposed for the measurement of an object position with a fluorescent optical fiber sensor having the structure of an optical potentiometer. A physical model is developed, showing how to combine different measurements to reject the influence of source intensity variations and other drifts also. Experimental results are presented, and good agreement with the model is obtained. Theoretical system resolution determination is also performed. Finally, comments are made about using the configuration in fiber optic sensor networks...
December 1, 1989: Applied Optics
William Durfee, James Carey, David Nuckley, Joan Deng
Motor retraining following stroke can occur through intensive, repetitive motion tasks that require concentration to promote new connections in the brain. Conducting intensive, repetitive therapy in the clinic is time consuming for both patient and therapist. A home-based, clinician-directed tracking training system for rehabilitation is presented. Two biofeedback motion training systems have been developed, one for hand and wrist motor relearning and the other for the ankle. The systems include a potentiometer joint sensor, a smart box interface and a laptop host computer...
2009: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Narayan Yoganandan, Frank A Pintar
OBJECTIVES: The objective of the study was to determine the optimal use of a new optical device, the RibEye system, intended to obtain internal ribcage deflections from tests using anthropomorphic test dummies. Specifically, the study was designed to determine the most efficacious mounting location of light emitting diodes (LEDs) on the ribs and sternum in the 50th percentile male Hybrid III dummy. METHODS: Optical signal drop-out and accuracy assessment tests were conducted...
October 2009: Traffic Injury Prevention
W M Honig, R H Eikelboom
We describe here techniques designed to aid both the physically and mentally handicapped. T.V. games and exercises for the handicapped have been designed and tested with patients. The system initially consisted of a central game box with a microprocessor, interchangeable memory cards, and body joint angle transducers which operate with a standard color television set. Associated software and additional transducers have been developed. The transducers used to date include lightpens, potentiometers, joysticks, the computer mouse and pressure sensors...
1985: IEEE Engineering in Medicine and Biology Magazine
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"